Compilare: main.cpp: In function 'int main()': main.cpp:107:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ds.size(); ++i){ ~~^~~~~~~~~~~ main.cpp:112:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < qs.size(); ++i){ ~~^~~~~~~~~~~ main.cpp: In function 'int ReadInt()': main.cpp:56:40: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,bsize,stdin); ^ main.cpp:67:40: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,bsize,stdin); ^ main.cpp: In function 'int main()': main.cpp:77:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("obstacole.in","r",stdin); ^ main.cpp:78:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("obstacole.out","w",stdout); ^