Compilare: main.cpp: In function 'void read()': main.cpp:12:56: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d%d", &n,&k1,&k2,&l1,&c1,&l2,&c2); ^ main.cpp:15:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &matrice[i][j]); ^ main.cpp: In function 'int main()': main.cpp:78:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("vis.in","r", stdin); ^ main.cpp:79:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("vis.out", "w", stdout); ^