Compilare: main.cpp: In function 'void Solve()': main.cpp:94:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < p.size() - 1;++i) ~~^~~~~~~~~~~~~~ main.cpp:100:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0;j < r.size() - 1;++j) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void calculate_area()': main.cpp:130:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0;i < r.size() - 1;++i) ~~^~~~~~~~~~~~~~ main.cpp: In function 'void inc()': main.cpp:27:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,32000,stdin); ^ main.cpp: In function 'void Read()': main.cpp:52:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("camera.in","r",stdin); ^