Compilare: main.cpp: In function 'int main()': main.cpp:35:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(k=0;k<A[j].size();k++) ~^~~~~~~~~~~~ main.cpp:40:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<A[0].size();i++) ~^~~~~~~~~~~~ main.cpp:19:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&n,&m); ^ main.cpp:24:40: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d %d",&x,&y,&c); ^