Compilare: main.cpp: In function 'int main()': main.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:57:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 1; i < a.size(); i++ ) ~~^~~~~~~~~~ main.cpp:59:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 1; j < b.size(); j++ ) ~~^~~~~~~~~~ main.cpp:99:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < res.size(); i++ ) ~~^~~~~~~~~~~~ main.cpp:9:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in","r",stdin); ^ main.cpp:10:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out","w",stdout); ^ main.cpp:18:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &m, &n);//cin >> m >> n; ^ main.cpp:22:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &aux);//cin >> aux; ^ main.cpp:28:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &aux);//cin >> aux; ^