Compilare: main.cpp: In function 'int main()': main.cpp:8:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rosiimici.in","r",stdin); ^ main.cpp:9:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("rosiimici.out","w",stdout); ^ main.cpp:13:22: warning: iteration 1004 invokes undefined behavior [-Waggressive-loop-optimizations] mat[i][j]=1; ~~~~~~~~~^~ main.cpp:10:18: note: within this loop for(int i=1;i<=100000;i++){ ~^~~~~~~~