Compilare: main.cpp: In function 'int main()': main.cpp:86:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.in","r",stdin); ^ main.cpp:87:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("suma4.out","w",stdout); ^ main.cpp:90:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:92:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&cost[i]); ^ main.cpp: In function 'void buildDp()': main.cpp:64:18: warning: 'col' may be used uninitialized in this function [-Wmaybe-uninitialized] col++; ^ main.cpp:68:23: warning: 'line' may be used uninitialized in this function [-Wmaybe-uninitialized] line++; ^