Compilare: main.cpp: In function 'int main()': main.cpp:25:41: warning: narrowing conversion of 'v1' from 'int' to 'double' inside { } [-Wnarrowing] V.push_back({v1, 1.0 / v2, i, 1}); ^ main.cpp:30:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < V.size(); i++){ ~~^~~~~~~~~~ main.cpp:32:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(V[i].a != V[i - 1].a && i + 1 < V.size() && V[i].b == V[i + 1].b) W.back().gud = 0; ~~~~~~^~~~~~~~~~ main.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < W.size(); i++){ ~~^~~~~~~~~~ main.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < S.size(); i++) ~~^~~~~~~~~~ main.cpp:46:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < S.size(); i++) ~~^~~~~~~~~~ main.cpp:20:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ main.cpp:24:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &v1, &v2); ^