Compilare: user.cpp: In function ‘int main()’: user.cpp:6:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.in","r",stdin); ^ user.cpp:7:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&s,&n,&c); ^ user.cpp:8:46: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=c;i++) scanf("%d %d",&L[i],&P[i]); ^ user.cpp:18:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sant.out","wt",stdout); ^ user.cpp:16:26: warning: ‘t’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[i][j]=min; b[i][j]=t; ^