Compilare: main.cpp: In function 'int32_t main()': main.cpp:189:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.size(); ++i) ~~^~~~~~~~~~ main.cpp:198:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= s.size() || s[i] != '3') ~~^~~~~~~~~~~ main.cpp:205:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= s.size()) ~~^~~~~~~~~~~ main.cpp:216:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= s.size() || s[i] != '2') ~~^~~~~~~~~~~ main.cpp:222:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i >= s.size()) ~~^~~~~~~~~~~ main.cpp:157:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("perle.in", "r", stdin); ^ main.cpp:158:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("perle.out", "w", stdout); ^