/**
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⡤⠤⣤⣄⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡴⠛⠉⠀⠀⠀⠀⠈⠙⢷⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⠟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⣆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣰⠶⣄⡀⠀⠀⠀⢠⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢹⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⡏⠀⠀⠉⠛⠶⣤⣸⡇⠀⠀⠀⠀⣀⣤⣶⣶⠒⠒⠒⠶⣬⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣀⣤⠴⠶⣿⠀⠀⠀⠀⠀⠀⠈⠉⠉⠛⠒⠶⢿⣭⣀⡀⢻⡀⠀⠀⢠⡿⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣤⠶⠛⠋⠁⠀⠀⢸⠃⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠉⠛⠷⣴⣞⠛⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣀⡴⠞⠉⠀⠀⠀⠀⠀⠀⢰⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠉⠛⢦⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⠞⠋⠀⠀⠀⠀⢀⡤⠠⡄⠀⢰⡏⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⠿⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⡞⠁⠀⠀⠀⠀⣠⠖⠋⠀⣸⠇⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⠀⢀⡀⠀⠀⠀⠀⠀⠀⢦⡀⠀⠀⠀⠸⣷⣄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⡼⠋⠀⠀⠀⠀⢀⣴⠋⢀⢀⡴⠋⠀⢀⣼⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣽⠀⣼⢿⡄⠀⠀⠀⠀⣆⠀⠉⢦⡀⠀⠀⠀⠘⢧⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⡟⠁⠀⠀⠀⠀⣠⠟⠇⠀⠈⠉⠁⠀⣀⣾⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡟⢰⠏⠀⠻⣄⠀⠀⠀⠹⣄⣰⠟⠁⠀⠀⠀⠀⠀⢻⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣾⡟⠀⢀⣀⡖⠀⣰⠏⠀⠀⠀⠀⠀⢀⣼⣿⠋⠸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣧⡟⠀⠀⠀⠹⣦⠀⠀⠀⠀⠁⠀⣶⠀⠀⣴⠛⢧⠀⢻⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⣠⠞⣩⡟⠀⠀⠈⠉⠀⢀⡟⠀⠀⢀⣀⣠⣤⣾⡿⠗⠒⠚⣿⠠⣤⠀⠀⠀⠀⠀⠀⠀⢸⣿⠓⠒⠲⠶⠶⠾⢷⣤⣀⣀⠀⠀⠙⣧⠀⠹⣆⣼⠃⠀⢷⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⢀⡴⠟⢁⡼⣿⠁⠀⠀⠀⠀⠀⢸⠃⠀⠀⠈⠉⢠⡾⠋⠀⠀⠀⠀⠸⣆⠙⣧⡀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠻⣆⠉⠁⠀⠀⢹⡄⠀⠈⠁⠀⠀⠘⣷⢦⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⣠⡶⠋⢀⡴⠋⢰⡏⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⣠⠟⠀⠀⠀⠀⠀⠀⠀⢻⡄⢸⣷⣄⠀⠀⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠈⢳⣄⠀⠀⠸⣧⠀⠀⠀⠀⠀⠀⢿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⢰⣾⡥⠴⠞⠋⠀⠀⣼⠀⠀⠀⠀⠀⠀⠀⣸⠀⠀⠀⣰⠏⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⡄⣷⠙⠷⣄⡀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⢷⣄⠀⣿⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣿⡆⠀⠀⠀⠀⠀⠀⢸⡄⠀⣼⢏⣀⣤⣶⣦⣤⣶⣶⣶⣶⣶⣿⣿⣾⡆⠀⠈⠻⢦⣼⡇⢰⣶⣶⣶⣶⣶⣶⣶⣤⣤⣤⣦⠙⢧⣿⠀⠀⠀⠀⠀⠀⢸⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣿⡇⠀⠀⠀⠀⠀⠀⠘⣇⣼⠏⠘⣿⡿⢿⣿⣿⣿⣿⣿⡏⠉⠉⠉⠙⠃⠀⠀⠀⠀⠉⠁⠘⠛⢻⣿⣿⣿⣿⣿⣟⠛⢛⠷⠀⠀⣿⠀⠀⠀⠀⠀⠀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⡟⣷⠀⠀⠀⠀⠀⠀⠀⢻⡏⠀⠀⠀⠀⣸⣿⣿⣿⣿⣿⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣾⣿⣿⣿⣿⣿⡇⠀⠀⠀⠀⢰⡏⠀⠀⠀⠀⠀⠀⣾⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣷⢹⣆⠀⠀⠀⠀⠀⠀⠈⣷⠀⠀⠀⠀⢹⣿⣿⣿⣿⣿⣿⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣿⣿⣿⣿⣿⣿⡇⠀⠀⠀⠀⣾⠀⠀⠀⠀⠀⠀⢰⣿⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢿⠘⣿⣆⠀⠀⠀⠀⠀⠐⠘⣧⠀⠀⠀⠘⢿⣿⣿⣿⣿⠏⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⢿⣿⣿⣿⡿⠃⠀⠀⠀⣼⠃⠀⠀⠀⠀⠀⣰⠟⠐⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠸⣇⣿⠙⣧⣄⠀⠀⠀⠀⠀⠘⢧⡀⠀⠀⠈⢹⠿⢟⡋⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠙⢻⡿⠀⡀⠀⠀⣼⠃⠀⠀⠀⠀⣀⡾⠋⠀⣴⣷⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⢻⣿⠀⣿⠝⠳⣤⣀⡀⠀⠀⠈⢷⣤⠇⢠⡞⠠⠾⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⠟⠁⡾⠃⣠⡾⠃⠀⠀⣀⣤⠾⠋⠀⠀⠀⡿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⣿⣸⣿⠀⠀⠀⠉⠙⠓⡶⠦⠤⣿⡆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠓⢰⡿⠤⠴⠶⣿⠉⠀⠀⠀⠀⠀⢠⡇⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⣿⢻⠀⠀⠀⠀⠀⠃⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢲⣄⠀⠀⠀⠀⠀⠀⠀⢀⣴⠆⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡟⠀⠀⠀⠀⠀⠀⢸⡇⣸⡇⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢠⡿⢸⡇⠀⠀⠀⠀⠀⢿⡄⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠈⠛⠲⠤⣤⠤⠴⠞⠋⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⡏⠀⠀⠀⠀⠀⠀⢸⠇⠈⣇⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣸⡇⢸⡇⠀⠀⠀⠀⠀⢸⣿⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢿⡇⠀⠀⠀⠀⠀⠀⢺⢀⠀⢿⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣸⢷⠛⣇⠀⠀⠀⠀⠀⠈⣿⠉⠻⣦⡀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⣠⣾⣅⣸⠀⠀⠀⠀⠀⠀⢀⣿⢸⡀⢸⡇⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⡿⠘⣀⣿⠀⠀⠀⠀⠀⢷⢸⡄⠀⠈⠙⠶⣤⣀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢀⣠⡴⠟⠁⠀⠈⣿⠀⠀⠀⠀⠀⠀⠈⡟⣼⡇⠀⣧⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⢰⡇⠀⢿⢿⠀⠀⠀⠀⠀⠀⠈⣧⠀⠀⠀⠀⠀⠉⠛⠶⢤⣤⣀⣀⠀⣀⡀⠀⠀⠀⠀⠀⢀⣠⡴⠞⠋⠁⠀⠀⠀⠀⢀⡏⠀⠀⠀⠀⠀⠀⢠⡇⢹⣤⠀⢹⡄⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⣼⠀⠀⡿⢸⡆⠀⠀⠀⠀⠀⠀⢻⡆⠀⠀⠀⠀⠀⠀⠀⠀⣿⡿⠟⠋⠉⠁⠀⠀⠀⠀⠀⢸⠁⠀⠀⠀⠀⠀⠀⠀⠀⢸⠇⠀⠀⠀⠀⠀⠀⢸⡇⠈⣟⠀⠈⣷⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⢰⡟⠀⢰⡇⠘⡇⠀⠀⠀⠀⠀⠘⠀⣷⠀⠀⠀⠀⠀⠀⠀⠀⣿⠁⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⠀⠀⠀⠀⠀⠀⠀⠀⠀⡿⠆⠀⠀⠀⠀⠀⠀⣼⠁⠀⢻⡀⠀⠸⣇⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⣼⠁⠀⣼⠁⠀⣿⠀⠀⠀⠀⠀⠀⠀⠻⣇⣀⠀⠀⠀⠀⠀⠀⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⡀⠀⠀⠀⠀⠀⠀⠀⣰⡇⠀⠀⠀⠀⠀⠀⠀⣿⡆⠀⠈⣷⡀⠀⢻⡄⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⢰⡇⠀⢀⡏⠀⠀⢻⠀⠀⠀⠀⠀⠀⠀⠀⢻⣦⣄⠀⠀⠀⠀⣠⡟⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠘⣧⠀⠀⠀⠀⠀⣠⣾⣿⠀⠀⠀⠀⠀⠀⢠⣠⡇⡇⠀⠀⠸⣯⡀⠀⢷⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⡾⠀⠀⣼⠁⠀⠀⠸⡇⠀⠀⠀⠀⠀⠀⠀⠀⢿⣽⡧⠴⢶⣿⣿⠖⠒⠛⠛⠃⠀⠀⠀⠚⠋⠉⠉⠉⠙⠓⠲⢾⡛⠻⣽⠃⠀⠀⠀⠀⠀⠀⢸⣿⣃⠀⠀⠀⠀⢹⣷⠀⠘⣧⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⣸⠃⠀⢸⡏⠀⠀⠀⢀⣿⠀⠀⠀⠀⢀⣀⠀⠈⠈⢷⠖⠚⠋⠁⢹⡇⠀⢀⣴⠶⠶⢦⣄⣀⣤⡶⠶⠤⠤⠤⠶⠾⠇⢰⡏⠀⠀⠀⠀⠀⠀⠻⣿⣿⣤⡀⠀⠀⠀⠀⢿⣀⠀⠸⣆⠀⠀⠀
⠀⠀⠀⠀⠀⢰⠏⠀⢀⡿⠀⠀⠀⣰⠟⢹⣿⡄⠀⠀⠀⠻⣄⠀⠀⠘⣷⣤⣄⣀⣈⡙⠛⢹⡷⢶⣦⣴⣾⣛⣻⢯⣴⣦⠴⠖⠃⠀⢀⡾⠀⠀⠀⠀⠀⠀⠀⢰⣿⡇⠀⠹⣆⠀⠀⠸⡞⣧⣆⠀⠹⣄⠀⠀
⠀⠀⠀⠀⢠⡟⠀⠀⡼⠁⠀⠀⣰⠏⠀⠈⣟⣧⠀⠀⠀⠀⢻⣆⠀⠀⠈⣧⡿⠀⠈⠉⠛⠛⣻⣿⡿⢿⣿⡍⠉⠀⠀⠀⠀⠀⠀⠀⡾⠁⠀⠀⠀⢀⣴⠀⠀⡾⣿⠁⠀⠀⠘⣧⠀⠀⢿⠘⣟⠀⠀⢻⡄⠀
⠀⠀⢀⣠⡟⠀⢀⡾⠃⠀⠀⣰⡏⠀⠀⠀⣻⠘⣧⠀⠀⠀⠀⢻⣷⡄⠀⠘⢷⡀⠀⠀⠀⠀⠩⣉⠁⠈⣛⡁⠀⠀⠀⠀⠀⠀⣀⣾⠁⠀⠀⣀⣠⣟⠁⠀⣠⣤⡟⠀⠀⠀⠀⠘⣧⡄⠘⡇⠙⣇⠀⠀⠻
*/
//#pragma GCC optimize("Ofast")
//#pragma GCC target ("avx2")
//#pragma GCC optimization ("O3")
//#pragma GCC optimization ("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define i64 long long
#define ld long double
#define bit(n,i) ((n>>i)&1)
#define pii pair<int,int>
#define sz(x) (int)((x).size())
#define FOR(i,a,b) for(int i=a; i<=b; i++)
#define FOD(i,a,b) for(int i=a; i>=b; i--)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(),x.end()
#define __sumairu__ main()
#define die_hard_onimai_fan void seggs()
#define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
#define brute(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".ans","w",stdout);}
#define TIME (1.0*clock()/CLOCKS_PER_SEC)
#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ai(n) array<int,n>
#define dbg(x) {cerr<<#x<<' '<<x<<endl;}
#define dbgArr(arr,n) {cerr<<#arr;FOR(_i,1,n)cerr<<' '<<(arr)[_i];cerr<<endl;}
template <typename T,typename U>
ostream& operator<<(ostream &os,pair<T,U>p){
return os<<"{"<<p.fi<<", "<<p.se<<"}";
}
mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
const int P=1e9+7;
//const int P=998244353;
const int inf=1e9;
///check the limits, dummy
const int N=30003;
const int S=200;
#define i64 long long
#define debug 1
vector<int>adj[N];
int d[N];
bool ck[N][S],vis[N];
die_hard_onimai_fan
{
int n,m;
cin>>n>>m;
int s,t;
FOR(i,1,m)
{
int a,b;
cin>>a>>b;
adj[a].pb(b);
if(i==1)s=a;
if(i==2)t=a;
}
d[t]=-1;
queue<ai(3)>q;
q.push({s,0,0});
while(sz(q))
{
auto [u,p,w]=q.front();
q.pop();
if(u<0||u>=n)continue;
if(abs(p)<S)
{
if(ck[u][abs(p)])continue;
ck[u][abs(p)]=1;
}
if(!vis[u])
{
vis[u]=1;
d[u]=w;
for(int v:adj[u])
{
q.push({u+v,v,w+1});
q.push({u-v,-v,w+1});
}
}
q.push({u+p,p,w+1});
}
cout<<d[t];
}
__sumairu__
{
FAST
file("");
int tt=1;//cin>>tt;
while(tt--)seggs();
cerr<<"\nTime elapsed: "<<TIME<<" s.\n";
}
/**
5 3
0 2
1 1
4 1
*/
Compilation message
skyscraper.cpp:61:21: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
61 | #define __sumairu__ main()
| ^~~~
skyscraper.cpp:132:1: note: in expansion of macro '__sumairu__'
132 | __sumairu__
| ^~~~~~~~~~~
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:63:53: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
63 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:135:5: note: in expansion of macro 'file'
135 | file("");
| ^~~~
skyscraper.cpp:63:83: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
63 | #define file(name) if(fopen(name".inp","r")){freopen(name".inp","r",stdin);freopen(name".out","w",stdout);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:135:5: note: in expansion of macro 'file'
135 | file("");
| ^~~~
skyscraper.cpp: In function 'void seggs()':
skyscraper.cpp:129:14: warning: 't' may be used uninitialized in this function [-Wmaybe-uninitialized]
129 | cout<<d[t];
| ^
skyscraper.cpp:106:11: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
106 | q.push({s,0,0});
| ~~~~~~^~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2904 KB |
Output is correct |
2 |
Correct |
1 ms |
2908 KB |
Output is correct |
3 |
Correct |
1 ms |
2908 KB |
Output is correct |
4 |
Correct |
1 ms |
2908 KB |
Output is correct |
5 |
Correct |
1 ms |
2904 KB |
Output is correct |
6 |
Correct |
1 ms |
2908 KB |
Output is correct |
7 |
Correct |
1 ms |
2908 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2908 KB |
Output is correct |
2 |
Correct |
1 ms |
2908 KB |
Output is correct |
3 |
Correct |
1 ms |
2904 KB |
Output is correct |
4 |
Correct |
1 ms |
2908 KB |
Output is correct |
5 |
Correct |
1 ms |
2908 KB |
Output is correct |
6 |
Correct |
1 ms |
2904 KB |
Output is correct |
7 |
Correct |
1 ms |
2908 KB |
Output is correct |
8 |
Correct |
1 ms |
2908 KB |
Output is correct |
9 |
Correct |
1 ms |
2908 KB |
Output is correct |
10 |
Correct |
1 ms |
2908 KB |
Output is correct |
11 |
Correct |
1 ms |
2908 KB |
Output is correct |
12 |
Correct |
1 ms |
2908 KB |
Output is correct |
13 |
Correct |
1 ms |
2908 KB |
Output is correct |
14 |
Correct |
1 ms |
2908 KB |
Output is correct |
15 |
Correct |
1 ms |
2908 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2908 KB |
Output is correct |
2 |
Correct |
1 ms |
2908 KB |
Output is correct |
3 |
Correct |
1 ms |
2908 KB |
Output is correct |
4 |
Correct |
1 ms |
2908 KB |
Output is correct |
5 |
Correct |
1 ms |
2908 KB |
Output is correct |
6 |
Correct |
1 ms |
2908 KB |
Output is correct |
7 |
Correct |
1 ms |
2908 KB |
Output is correct |
8 |
Correct |
1 ms |
2908 KB |
Output is correct |
9 |
Correct |
1 ms |
2908 KB |
Output is correct |
10 |
Correct |
1 ms |
2908 KB |
Output is correct |
11 |
Correct |
1 ms |
2908 KB |
Output is correct |
12 |
Correct |
1 ms |
2908 KB |
Output is correct |
13 |
Correct |
1 ms |
2908 KB |
Output is correct |
14 |
Correct |
1 ms |
2908 KB |
Output is correct |
15 |
Correct |
1 ms |
2908 KB |
Output is correct |
16 |
Correct |
1 ms |
2908 KB |
Output is correct |
17 |
Correct |
1 ms |
2908 KB |
Output is correct |
18 |
Correct |
1 ms |
2908 KB |
Output is correct |
19 |
Correct |
1 ms |
2908 KB |
Output is correct |
20 |
Correct |
1 ms |
3164 KB |
Output is correct |
21 |
Correct |
1 ms |
2908 KB |
Output is correct |
22 |
Correct |
1 ms |
2908 KB |
Output is correct |
23 |
Correct |
1 ms |
3160 KB |
Output is correct |
24 |
Correct |
2 ms |
3164 KB |
Output is correct |
25 |
Correct |
2 ms |
3164 KB |
Output is correct |
26 |
Correct |
2 ms |
3164 KB |
Output is correct |
27 |
Correct |
2 ms |
3160 KB |
Output is correct |
28 |
Correct |
2 ms |
3236 KB |
Output is correct |
29 |
Correct |
2 ms |
3164 KB |
Output is correct |
30 |
Correct |
1 ms |
3164 KB |
Output is correct |
31 |
Correct |
1 ms |
3164 KB |
Output is correct |
32 |
Correct |
1 ms |
3164 KB |
Output is correct |
33 |
Correct |
2 ms |
3168 KB |
Output is correct |
34 |
Correct |
2 ms |
3164 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2908 KB |
Output is correct |
2 |
Correct |
1 ms |
2908 KB |
Output is correct |
3 |
Correct |
1 ms |
2904 KB |
Output is correct |
4 |
Correct |
1 ms |
2908 KB |
Output is correct |
5 |
Correct |
1 ms |
2908 KB |
Output is correct |
6 |
Correct |
1 ms |
2908 KB |
Output is correct |
7 |
Correct |
1 ms |
2904 KB |
Output is correct |
8 |
Correct |
1 ms |
2904 KB |
Output is correct |
9 |
Correct |
1 ms |
2908 KB |
Output is correct |
10 |
Correct |
1 ms |
2908 KB |
Output is correct |
11 |
Correct |
1 ms |
2916 KB |
Output is correct |
12 |
Correct |
1 ms |
2912 KB |
Output is correct |
13 |
Correct |
1 ms |
2908 KB |
Output is correct |
14 |
Correct |
1 ms |
2908 KB |
Output is correct |
15 |
Correct |
1 ms |
2908 KB |
Output is correct |
16 |
Correct |
1 ms |
2908 KB |
Output is correct |
17 |
Correct |
1 ms |
2908 KB |
Output is correct |
18 |
Correct |
1 ms |
2908 KB |
Output is correct |
19 |
Correct |
1 ms |
2908 KB |
Output is correct |
20 |
Correct |
1 ms |
3164 KB |
Output is correct |
21 |
Correct |
1 ms |
2904 KB |
Output is correct |
22 |
Correct |
1 ms |
2904 KB |
Output is correct |
23 |
Correct |
1 ms |
3164 KB |
Output is correct |
24 |
Correct |
1 ms |
3164 KB |
Output is correct |
25 |
Correct |
1 ms |
3164 KB |
Output is correct |
26 |
Correct |
1 ms |
3164 KB |
Output is correct |
27 |
Correct |
1 ms |
3164 KB |
Output is correct |
28 |
Correct |
2 ms |
3164 KB |
Output is correct |
29 |
Correct |
2 ms |
3164 KB |
Output is correct |
30 |
Correct |
1 ms |
3164 KB |
Output is correct |
31 |
Correct |
1 ms |
3164 KB |
Output is correct |
32 |
Correct |
1 ms |
3164 KB |
Output is correct |
33 |
Correct |
2 ms |
3164 KB |
Output is correct |
34 |
Correct |
3 ms |
3164 KB |
Output is correct |
35 |
Correct |
5 ms |
4144 KB |
Output is correct |
36 |
Correct |
2 ms |
3160 KB |
Output is correct |
37 |
Correct |
6 ms |
3928 KB |
Output is correct |
38 |
Correct |
8 ms |
4244 KB |
Output is correct |
39 |
Correct |
7 ms |
4188 KB |
Output is correct |
40 |
Correct |
7 ms |
4288 KB |
Output is correct |
41 |
Correct |
7 ms |
4320 KB |
Output is correct |
42 |
Correct |
5 ms |
4188 KB |
Output is correct |
43 |
Correct |
4 ms |
4380 KB |
Output is correct |
44 |
Correct |
5 ms |
4184 KB |
Output is correct |
45 |
Correct |
14 ms |
4444 KB |
Output is correct |
46 |
Correct |
9 ms |
4440 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
2908 KB |
Output is correct |
2 |
Correct |
1 ms |
2908 KB |
Output is correct |
3 |
Correct |
1 ms |
2908 KB |
Output is correct |
4 |
Correct |
1 ms |
2908 KB |
Output is correct |
5 |
Correct |
1 ms |
2908 KB |
Output is correct |
6 |
Correct |
1 ms |
2908 KB |
Output is correct |
7 |
Correct |
1 ms |
2908 KB |
Output is correct |
8 |
Correct |
1 ms |
2908 KB |
Output is correct |
9 |
Correct |
1 ms |
2908 KB |
Output is correct |
10 |
Correct |
1 ms |
2908 KB |
Output is correct |
11 |
Correct |
1 ms |
2908 KB |
Output is correct |
12 |
Correct |
1 ms |
2908 KB |
Output is correct |
13 |
Correct |
1 ms |
2908 KB |
Output is correct |
14 |
Correct |
1 ms |
2908 KB |
Output is correct |
15 |
Correct |
1 ms |
2908 KB |
Output is correct |
16 |
Correct |
1 ms |
3160 KB |
Output is correct |
17 |
Correct |
1 ms |
2908 KB |
Output is correct |
18 |
Correct |
1 ms |
2908 KB |
Output is correct |
19 |
Correct |
1 ms |
2908 KB |
Output is correct |
20 |
Correct |
1 ms |
3164 KB |
Output is correct |
21 |
Correct |
1 ms |
2908 KB |
Output is correct |
22 |
Correct |
1 ms |
2908 KB |
Output is correct |
23 |
Correct |
1 ms |
3164 KB |
Output is correct |
24 |
Correct |
1 ms |
3288 KB |
Output is correct |
25 |
Correct |
2 ms |
3220 KB |
Output is correct |
26 |
Correct |
1 ms |
3164 KB |
Output is correct |
27 |
Correct |
1 ms |
3164 KB |
Output is correct |
28 |
Correct |
2 ms |
3164 KB |
Output is correct |
29 |
Correct |
2 ms |
3160 KB |
Output is correct |
30 |
Correct |
1 ms |
3164 KB |
Output is correct |
31 |
Correct |
1 ms |
3312 KB |
Output is correct |
32 |
Correct |
1 ms |
3252 KB |
Output is correct |
33 |
Correct |
3 ms |
3160 KB |
Output is correct |
34 |
Correct |
2 ms |
3164 KB |
Output is correct |
35 |
Correct |
7 ms |
3932 KB |
Output is correct |
36 |
Correct |
2 ms |
3168 KB |
Output is correct |
37 |
Correct |
6 ms |
4084 KB |
Output is correct |
38 |
Correct |
7 ms |
4188 KB |
Output is correct |
39 |
Correct |
7 ms |
4192 KB |
Output is correct |
40 |
Correct |
7 ms |
4192 KB |
Output is correct |
41 |
Correct |
7 ms |
4440 KB |
Output is correct |
42 |
Correct |
5 ms |
4188 KB |
Output is correct |
43 |
Correct |
4 ms |
4188 KB |
Output is correct |
44 |
Correct |
4 ms |
4188 KB |
Output is correct |
45 |
Correct |
10 ms |
4440 KB |
Output is correct |
46 |
Correct |
15 ms |
4444 KB |
Output is correct |
47 |
Correct |
17 ms |
6236 KB |
Output is correct |
48 |
Correct |
6 ms |
3420 KB |
Output is correct |
49 |
Correct |
4 ms |
3528 KB |
Output is correct |
50 |
Correct |
3 ms |
3416 KB |
Output is correct |
51 |
Correct |
12 ms |
8028 KB |
Output is correct |
52 |
Correct |
14 ms |
8052 KB |
Output is correct |
53 |
Correct |
9 ms |
8024 KB |
Output is correct |
54 |
Correct |
3 ms |
7004 KB |
Output is correct |
55 |
Correct |
3 ms |
7004 KB |
Output is correct |
56 |
Correct |
8 ms |
8284 KB |
Output is correct |
57 |
Correct |
8 ms |
7260 KB |
Output is correct |
58 |
Correct |
6 ms |
8020 KB |
Output is correct |
59 |
Correct |
8 ms |
8028 KB |
Output is correct |
60 |
Correct |
9 ms |
8036 KB |
Output is correct |
61 |
Correct |
8 ms |
8264 KB |
Output is correct |
62 |
Correct |
16 ms |
8284 KB |
Output is correct |
63 |
Correct |
29 ms |
7792 KB |
Output is correct |
64 |
Correct |
31 ms |
7724 KB |
Output is correct |
65 |
Correct |
51 ms |
7760 KB |
Output is correct |
66 |
Correct |
99 ms |
8276 KB |
Output is correct |
67 |
Correct |
86 ms |
8056 KB |
Output is correct |