Compilare: main.cpp: In function 'std::pair<int, int> rez()': main.cpp:41:8: warning: statement has no effect [-Wunused-value] for (i; i < s.size(); i++) { ^ main.cpp:41:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i; i < s.size(); i++) { ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:104:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.in", "r", stdin); ^ main.cpp:105:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("ecuatii2.out", "w", stdout); ^