interval.cpp:6:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
main(){
^
interval.cpp: In function 'int main()':
interval.cpp:13:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<x.size();i++){
~^~~~~~~~~
interval.cpp:15:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(a=i;a<x.size();a++){
~^~~~~~~~~
interval.cpp:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<z.size();i++){
~^~~~~~~~~
interval.cpp:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(a=i;a<z.size();a++){
~^~~~~~~~~