Compilare: user.cpp: In function ‘int solve(char, int)’: user.cpp:83:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j<strlen(mat[i]); j++) ^ user.cpp:90:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:94:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.in", "r", stdin); ^ user.cpp:95:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("apel.out", "w", stdout); ^ user.cpp:97:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", S); ^ user.cpp:100:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s", lin); ^