parentrises.cpp: In function 'int main()':
parentrises.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<s.size();i++)
~^~~~~~~~~
parentrises.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<s.size();i++)
~^~~~~~~~~
parentrises.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<s.size();i++)
~^~~~~~~~~
parentrises.cpp:64:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<s.size();i++)
~^~~~~~~~~
parentrises.cpp:70:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(i=0;i<s.size();i++)
~^~~~~~~~~
parentrises.cpp:11:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
freopen("data.in","r",stdin);
~~~~~~~^~~~~~~~~~~~~~~~~~~~~