Compilare: user.cpp: In function ‘int main()’: user.cpp:50:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spectacole.in", "r", stdin); ^ user.cpp:51:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("spectacole.out", "w", stdout); ^ user.cpp:53:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ user.cpp:55:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i]); ^ user.cpp:57:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &b[i]); ^ user.cpp:59:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &spec[i].sala, &spec[i].x, &spec[i].y); ^ user.cpp: In function ‘int cb(int, int)’: user.cpp:45:26: warning: ‘last’ may be used uninitialized in this function [-Wmaybe-uninitialized] return spec[v[poz][last]].maxval; ^ user.cpp: In function ‘int main()’: user.cpp:86:7: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(j = 1; j <= nrc; ++ j) ^