Compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= N; i++) ^ user.cpp:31:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 2; i <= N; i++) ^ user.cpp:34:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= N; i++) ^ user.cpp:35:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = i; j <= N; j++) ^ user.cpp:39:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( c > sol ) ^ user.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( c == sol ) ^ user.cpp:48:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( j < finish ) ^ user.cpp:54:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if( j == finish ) ^