Compilare: user.cpp: In function ‘void cauta(int, int, int)’: user.cpp:15:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[ l + 1 ][ c ] >= x) ^ user.cpp:17:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(b[ l + 1 ][ c ] < x) ^ user.cpp: In function ‘int main()’: user.cpp:33:21: warning: unused variable ‘x’ [-Wunused-variable] for (int i = 1, x; i <= n; ++i){ ^ user.cpp:27:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.in", "r", stdin); ^ user.cpp:28:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("summax.out", "w", stdout); ^ user.cpp:30:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &q); ^ user.cpp:31:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &st, &dr); ^ user.cpp:37:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[ i ][ j ]); ^